San Mateo is a city located in California. With a 2020 population of 104,983, it is the 68th largest city in California and the 298th largest city in the United States. San Mateo is currently declining at a rate of -0.02% annually but its population has increased by 8.00% since the most recent census, which recorded a population of 97,207 in 2010. San Mateo reached it's highest population of 105,025 in 2018. Spanning over 16 miles, San Mateo has a population density of 8,626 people per square mile.
The average household income in San Mateo is $154,600 with a poverty rate of 7.57%. The median rental costs in recent years comes to $2,301 per month, and the median house value is $1.01 Mn. The median age in San Mateo is 38.5 years, 37 years for males, and 39.8 years for females. For every 100 females there are 99.3 males.